Update 5/18/17 1:55 pm: The Associated Press has now reported a correction of an earlier story, after a Senate Committee clarified that they had not received a response from Michael Flynn's legal team.

The North Carolina senator later clarified his statement, leaving the question of whether Flynn would comply with the subpoena up in the air.

The subpoena probing Flynn's ties to Russia is part of a broader investigation into Russian interference in the 2016 presidential election and alleged collusion between President Trump's campaign and Moscow.

A report by the New York Times claims the Trump administration knew in January 2017 of adviser Michael Flynn's contact with Russian diplomats. Fl...

Amid Justice interest, Trump formally chose Flynn as his national security adviser. In 2008, the House voted to hold White House Chief of Staff Josh Bolten and former White House counsel Harriet Miers in contempt over their refusal to cooperate with an investigation into the mass firings of US attorneys by the administration of George W. Bush.

Flynn Intel was paid only $530,000 for the work, which ended in November after Trump's election victory.

Burr says he would welcome Flynn's willingness to cooperate. It is also unclear whether, given the subject matter, there is any reason the Senate could not determine that Mueller is the appropriate U.S. Attorney for the matter.

On March 30, Flynn offered to testify before both the House and Senate Intelligence Communities in exchange for immunity. Robert Kelner, Flynn's attorney, stated that the former national security adviser would not "submit to questioning in such a highly politicized, witch-hunt environment without assurances against unfair prosecution". That process could take years due to procedure, Politico reports. RT has been branded a propaganda outlet by US intelligence officials.

Just as the Supreme Court has long recognized congressional subpoena power, so too has it upheld the enforcement power of contempt.